Link Gap Analysis: Find the Links Your Rivals Have

Most link-building advice for a plumber or a roofer is worthless: write great content, earn links naturally, buy a $99/mo tool seat. None of it tells you which specific websites in your trade are willing to link to a contractor.

The answer is already sitting in your competitors' backlink profiles. One hour with a free tool pulls it out. This is the workflow, plus the qualification filter that kills most of the list before you waste an email.

What is a link gap analysis, and why is it the highest-yield hour in off-page?

A link gap analysis compares your backlink profile against several competitors and returns the domains linking to them but not to you — Moz's Link Intersect report does this against up to five competitors at once, and a free Moz Community account gets you 10 queries a month.

It is the highest-yield hour in off-page work because it skips guessing. You are not brainstorming who might link to an HVAC company. You are reading a list of sites that already did, five times over, for businesses exactly like yours.

The prize is not the individual link. It is the pattern. When four of five competitors have a link from the same manufacturer's dealer locator, the same county trade chapter, and the same youth-sports sponsor page, you have just found the permanent link infrastructure of your trade in your market — and it took an hour.

Who are your real link competitors — and are they the same as your business competitors?

Your link competitors are the 3-5 domains that actually rank in the top 10 for your money keyword, which is usually not the same list as the 3 shops you lose bids to. Search your primary term ('emergency plumber + city'), skip the ads, skip the map pack, and write down the organic sites.

Two hard exclusions. Do not intersect against aggregators like Angi, Yelp, Thumbtack or a national franchise site — their backlink profiles are enormous, mostly unreachable, and will bury your list in noise. And do not intersect against a competitor who ranks purely because they are 25 years old with a 2004 domain; their links are historical, not repeatable.

You want operators your size, ranking now, in your metro or an adjacent one. If a competitor two cities over ranks with a thin site, their link profile is short — and a short profile is a readable profile. Pair this with a proper keyword research pass for a service business so you're intersecting against the sites that own terms you actually want.

How do you run the intersect on free and cheap tool tiers?

You do not need a $139/mo seat to do this once — a free Moz account runs the intersect, and Ahrefs' entry Starter plan is $29/mo if you want deeper data. Here is the honest landscape:

Verdict: start on Moz's free tier. Ten queries is enough for one competitor-set intersect plus a few spot checks, and it costs nothing. Only move to Ahrefs Starter at $29/mo if you are doing this monthly. Semrush at $139/mo is a fine tool and a bad way to buy one report.

The workflow itself, on any tier:

• Enter your domain as the target, then your 3-5 competitor domains.
• Sort by how many competitors each linking domain hits. A domain linking to 3+ of them is a structural source, not a fluke.
• Export to CSV. Delete every row that is a directory-of-directories, a scraper, or a foreign-language domain.
• Tag what is left by type: manufacturer, association, supplier, rebate program, sponsorship, local press.
• The tags — not the rows — are your link plan.

Which link sources are structural to your trade and nobody documents?

Six source types produce almost every link a local trade business can realistically earn, and five of them are gated by paperwork you may already qualify for rather than by content quality.

That last row matters more than it used to. In Whitespark's 2026 Local Search Ranking Factors survey — 47 local-search experts scoring 187 factors — 'presence on expert-curated best-of lists' was the single highest-scoring factor for AI search visibility, and three of the top five AI-visibility factors were citation factors. Whitespark's own summary: 'In AI SEO, mentions (citations) are the new link.'

Now the part nobody tells you. Most manufacturer locators do not produce a link at all. GAF's roofing contractor locator is a zip-code search widget. Mitsubishi Electric's find-a-contractor page for its independent Diamond Contractor network is a zip-code form that routes you into a lead-capture flow. If the directory never renders a crawlable, indexable profile page with your domain in the HTML, being listed is a lead source and a brand citation — not a backlink. Both can be worth doing. Only one of them shows up in an intersect.

How do you throw out 80% of the prospects before writing a single email?

Five checks. A prospect that fails any one of them gets deleted before you draft anything, which is what turns a 200-row CSV into a shortlist you can work in an afternoon.

• Is the link real? Open a competitor's listing on that site, view the page source, and search for their domain. If it only exists inside a rendered map widget, it is not a link.
• Is the page indexed? Run a site: search for the directory's profile URLs. A directory Google has not indexed passes nothing.
• Do you actually qualify? Certification, membership dues, license, service-area boundary. Half the roster links in any trade are gated by something you either have or can buy legitimately.
• Is there a human? A named person with an email address. 'info@' is where outreach goes to die.
• Does it link to 2+ of your competitors? From the intersect. A site that already links to two contractors has no editorial reason to refuse a third.

One more filter, and it is a hard no. If the site has a 'write for us' page with a price, or a rate card for a 'guest post,' walk away. Google's spam policies name 'exchanging money for links' and 'exchanging goods or services for links' as link spam outright, along with 'low-quality directory or bookmark site links.' That is the whole business model of most people who will email you back within an hour.

Sponsorships sit in a narrower lane. Google says buying and selling links 'is a normal part of the economy of the web for advertising and sponsorship purposes' and is not a violation 'as long as they are qualified with a rel=nofollow or rel=sponsored attribute value.' So sponsor the little league team for the local prominence and the citation — never on the promise of ranking juice. Anyone selling you sponsorship links as a ranking tactic is selling you a policy violation.

What does the supplier-page and sponsorship outreach email look like?

Both emails run under 120 words, name a real person, and ask for exactly one thing. Long, flattering, three-paragraph outreach emails get deleted by the same office manager who would have said yes to two sentences.

Supplier / manufacturer page. Subject: 'Contractor listing — [Your Company], [City]'. Body: 'Hi [Name] — we're a [trade] contractor in [City] and we've been installing [Brand] for [N] years; we buy through [Branch/Rep name]. I noticed [Competitor] is on your certified-installer page for our county. We hold [certification/license], and I'd like to be added. Our listing details: [business name, address, phone, website]. Who should I send the certificate to? Thanks, [Name].' It works because it is not a favor — it is you completing a program you already pay into.

Local sponsorship. Subject: 'Sponsoring the [Team/Event] this season'. Body: 'Hi [Name] — I'm [Name] at [Company], a [trade] business in [City]. We'd like to sponsor [Team/Event] at the [$ tier] level for this season. I see the sponsor page lists company names — could you include our website link with our listing? Happy to send the logo and a short blurb today. Check goes out this week.' Ask for the link before the money moves, not after. And expect it to be nofollow — that is the correct outcome, not a failure.

How many of these links can you get without an agency?

Most of them — the structural sources in a single trade in a single metro are a two-digit list, not a four-digit one, and they are won with paperwork, dues and phone calls, not with SEO skill. Manufacturer listings, chapter rosters, rebate program lists, supplier pages and sponsorships: an owner or an office manager can close every one of those categories without hiring anybody.

What you cannot do alone is the layer above: the linkable asset, the data story a local reporter picks up, the ongoing digital PR. That is real work with real cost. But paying an agency $2,500/mo to submit your NAP to a manufacturer directory is setting money on fire — and any 'link package' quoting you 50 links a month is describing the thing Google's policy calls link spam.

Run the intersect first. Then decide what is actually left for someone else to do. Our link building guide for service businesses covers what happens after the shortlist, and the home services SEO playbook puts links in their real place — behind Google Business Profile and service pages in the priority order.

Where should this sit in your SEO program?

Links are the third job, not the first. For a service business, the order that works is: a page for every service you sell, a Google Business Profile that is fully filled out, and then the link gap. If you invert that and start with links, you are pushing authority at pages that cannot convert it.

If you want the intersect run against your actual competitors — and an honest read on whether links are even your bottleneck — that is part of what we do in our SEO work and in the industry-specific programs like HVAC SEO. No lock-in, month-to-month, and you keep every link you earn. Get my free audit.